Mobile Skills
A skill is a set of lessons focused on a particular topic, such as present tense verbs or sports vocabulary.


Skills are organized into a language tree. These skills are named after the part(s) of speech, grammar or subject that the skill covers. Every language tree begins with Basics skills that provide the vocabulary to begin constructing simple sentences and to start learning a language.

Completing all the lessons in a skill completes the skill and rewards the user with two lingot.[1]

Skill strength and decayEdit

Decayed Skill

A skill with very low strength.

Each skill has a strength associated with it. When a skill is first learned -- either by completing the lessons or passing a test -- it is at full strength. Over time, if not practiced, it decays. Practicing the skill will raise its strength back up. 

There are several ways to increase the strength of a skill:

Skill decay occurs when learners don't practice the words in a skill. The rate of decay depends on factors such as how much the words have been practiced and how well the user did when practicing them.[3]

Types of skillsEdit

Skill icons2 (2)

There are several types of skills used to teach concepts to language learners and some teach the core grammar while others teach subject specific skills. These skills cover topics such as:

  • Grammar - This is taught throughout the tree and may include lessons on parts of speech, tenses and moods, grammatical particles, cases, or other topics depending on the specifics of the particular language's grammar.
  • Subject-specific vocabulary - Duolingo covers many subjects within the tree such as sports, clothing, and food.
  • Bonus Skill - These come in various forms and teach things such as idioms or holiday vocabulary.

See also Edit


  1. Lingot store
  3. "Notice some changes in word strength?".

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